Cashco 1164 - Manual (Page 3)

IOM-1164 3
V. SHUTDOWN
1. On systems with a bypass valve, and where sys-
tem pressure is to be maintained as the reg u la tor
is shut down, slowly open the bypass valve while
closing the inlet (up stream) block valve. Fully
close the inlet (upstream) block valve. (When on
bypass, the system pressure must be con stant ly
observed and manually regulated.) Close the outlet
(downstream) block valve.
SECTION V
SECTION VI
2. If the regulator and system are both to be shut down,
slowly close the inlet (upstream) block valve. Close
the outlet (downstream) valve only if reg u la tor re-
moval is required.
A. General:
1. Maintenance procedures hereinafter are based
upon re mov al of the regulator from the pipe line
where installed.
2. Owner should refer to owner’s procedures
for re mov al, handling, cleaning and disposal
of non-reusable parts, i.e. asbestos gaskets,
etc.
3. Refer to Figure 1 for basic regulator con-
struc tion. For a blow-up of the TFE seat trim,
see Figure 2.
B. Diaphragm Replacement:
1. Securely install the body (1) in a vise with the
spring chamber (2) directed upwards.
2. Relax range spring (3) by turning adjusting
screw (17) CCW until removed from spring
chamber (2).
3. Draw or embed a match mark between body
casting (1) and spring chamber casting (2)
along fl anged area.
4. Remove all diaphragm fl ange nuts (14) and
bolts (13).
5. Remove spring chamber (2), range spring (3)
and spring button (4).
6. Remove pressure plate (5) and inspect to
ensure no deformation due to over-pres sur -
iza tion. If deformed, replace.
7. Remove diaphragm (9), diaphragm gasket
(10), and O-ring (11).
8. Clean body (1) and diaphragm fl ange. NOTE:
On valves originally supplied as “special
cleaned”, option 1164-55, main te nance must
include a level of clean li ness equal to Cashco’s
cleaning standard #S-1134. Contact factory
for details.
9. Install new O-ring (11), diaphragm gasket (10),
and di a phragm. Apply a light coat of gasket
sealant.
VI. MAINTENANCE
10. Center pressure plate (5) on diaphragm (9).
Place the range spring (3) on to the retainer
hub of the pressure plate (5).
11. Place multi-purpose, high temperature grease
into de pres sion of spring button (4) where ad-
justing screw bears. Set spring button (4) onto
range spring (3); ensure spring button (4) is
laying fl at.
12. Aligning the match marks, place spring cham-
ber (2) over the above stacked parts. Apply
pressure (manually) to the spring chamber (2)
from opposite sides to compress the spring
(7), so bolting can be started from opposite
sides. Install all bolts (13) and nuts (14) by
CAUTION
Do not walk away and leave a bypassed reg u la tor
unattended.
WARNING
SYSTEM UN DER PRES SURE. Prior to performing any
maintenance, isolate the reg u la tor from the system and
relieve all pres sure. Failure to do so could result in per-
sonal injury.
WARNING
SPRING UNDER COMPRESSION. Prior to re mov ing
spring chamber, relieve spring com pres sion by back ing
out the ad just ing screw. Failure to do so may result in
fl ying parts that could cause personal injury.
CAUTION
When reassembling, the spring (7) will be under compres-
sion. Center all internal parts be fore plac ing the spring
chamber.